9.24.3 Symbolic Operand Modifiers

The assembler supports several modifiers when using symbol addresses
in 68HC11 and 68HC12 instruction operands. The general syntax is
the following:

%modifier(symbol)

%addr

This modifier indicates to the assembler and linker to use
the 16-bit physical address corresponding to the symbol. This is intended
to be used on memory window systems to map a symbol in the memory bank window.
If the symbol is in a memory expansion part, the physical address
corresponds to the symbol address within the memory bank window.
If the symbol is not in a memory expansion part, this is the symbol address
(using or not using the %addr modifier has no effect in that case).

%page

This modifier indicates to use the memory page number corresponding
to the symbol. If the symbol is in a memory expansion part, its page
number is computed by the linker as a number used to map the page containing
the symbol in the memory bank window. If the symbol is not in a memory
expansion part, the page number is 0.

%hi

This modifier indicates to use the 8-bit high part of the physical
address of the symbol.

%lo

This modifier indicates to use the 8-bit low part of the physical
address of the symbol.

For example a 68HC12 call to a function ‘foo_example’ stored in memory
expansion part could be written as follows: